A frame is provided with at least two holes to fasten electrical and/or electronic devices. The frame includes a single body having fastening means to be fastened on at least one flush-mounted box, and that includes a first part incorporating a hole intended to be fastened on a flush-mounted box by fastening means adapted to fasten the frame on the flush-mounted box and a second part incorporating a hole that is not associated to a flush-mounted box. The frame, at least on the part incorporating the hole that is not associated to a box shows at least a separator element supporting the frame on the wall on which it is to be installed. The separator element is constituted by the frame itself folded creating a flap or rim, the separator element spanning on the whole or part of the perimeter of the frame.